Bump Android target SDK version to 33

Google wants this done by August 31:

    https://developer.android.com/google/play/requirements/target-sdk

The implications of this for framework projects appear to be minimal.
The biggest one is probably the change to media permissions which makes
them more granular - but we're not handling the permission granting flow
correctly yet anyways, so it's really a nothingburger.

SampleGame.Android/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="SampleGame.Android" android:installLocation="auto">
-	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="31" />
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="33" />
 	<application />
 </manifest>

osu.Framework.Tests.Android/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="osu.Framework.Tests.Android" android:installLocation="auto">
-	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="31" />
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="33" />
 	<application android:label="osu!framework test" />
 </manifest>